[Refactor] Move APIFormat functions into convert package (#12856)

* USER APIFormat -> ToUser

* Migrate more and mark APIFormat deprecated

* models.Comment APIFormat() -> convert.ToComment

* models.Release APIFormat() -> convert.ToRelease

* models.Attachments APIFormat() -> convert.ToReleaseAttachments

* models.CommitStatus APIFormat() -> convert.ToCommitStatus

* finish migration to convert.ToUser

* Move Test

* Imprufe Test

* fix test

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

modules/convert/issue_comment.go

@@ -0,0 +1,24 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package convert
+
+import (
+	"code.gitea.io/gitea/models"
+	api "code.gitea.io/gitea/modules/structs"
+)
+
+// ToComment converts a models.Comment to the api.Comment format
+func ToComment(c *models.Comment) *api.Comment {
+	return &api.Comment{
+		ID:       c.ID,
+		Poster:   ToUser(c.Poster, false, false),
+		HTMLURL:  c.HTMLURL(),
+		IssueURL: c.IssueURL(),
+		PRURL:    c.PRURL(),
+		Body:     c.Content,
+		Created:  c.CreatedUnix.AsTime(),
+		Updated:  c.UpdatedUnix.AsTime(),
+	}
+}